And honestly, compared to Reynolds, Asher, Stross and Banks I find the old 'hard-core' SciFi by Dick and Heinlein rather... dull. Not entirely sure what it is, but the classics are less gripping to me.
But then: The gold age of SciFi is between 8 and 12 :)
Only someone who doesn't truly love Sci-fi can say that ... Also, if you are saying that Dick is dull (by the way, Dick is totally different from Heinlein), than you have no clue and your opinion does not count. :-)
Other new good hard SF writers might be Cory Doctorow, Michael Chabon, Rachel Swirsky, Sara Genge, Geoffrey Landis, Elizabeth Bear, Ted Chiang, Paolo Bacigalupi, Aliette de Bodard, Mary Robinette Kowal, Charlie Jane Anders, Felicity Shoulders, and Ian Tregillis. I haven't read them all, but they're all at least on my reading list for good hard SF due to recommendations from friends I trust.
And I'll second the Alistair Reynolds recommendation too.
and really quite enjoyed http://en.wikipedia.org/wiki/The_Nights_Dawn_Trilogy
and found pretty much everything in http://en.wikipedia.org/wiki/Revelation_Space_universe to be as good as anything I've read by Heinlein, Clark et al.
Honestly, there's tons of good stuff out there, but it's just hard to separate it from the pulp. With the oldie goldies it's relatively easy because we have a few decades of people assessing those books.